Abstract
Based on the advantages of the electric motor such as fast and precise torque response, the performance of the electric vehicle (EV) can be improved. During braking or driving on the cornering, the vehicle will over steer or under steer if a car turns by more or less than the amount commanded by the driver. To improve the stability of the small EV with four in-wheel motors, the differential regenerative braking torque control is proposed. In this system, the regenerative braking torque at each wheel will be controlled individually based on the value of slip ratio. If the slip ratio is greater than the optimum value, the regenerative brake will turn off. In this situation, the electric motor will not produce the regenerative braking torque. Conversely, if the slip ratio lower than the optimum value, the regenerative brake will turn on and the electric motor will generate the regenerative braking torque. In the numerical analysis, to investigate the effectiveness of the proposed model, the road condition is set to an icy road on the left tire and dry asphalt on the right tire. From the simulation results, the differential regenerative braking torque control can prevent the tire from lock-up and avoid the vehicle from skidding.
Highlights
In recent years, due to the environmental problems and growing needs of energy, electric vehicles (EVs) are gradually gaining attention to the consumers and manufacturers [1]
After 4 seconds, the rotational speed of uFL and uRL was similar with the speed of u, uFR and uRR. It means that in the low-speed condition, the regenerative braking force produced by the electric motor is every small and not affect the slip of the tire
The second part of this study is to investigate the effect of the differential regenerative braking torque control on the dry asphalt and icy road
Summary
Due to the environmental problems and growing needs of energy, electric vehicles (EVs) are gradually gaining attention to the consumers and manufacturers [1]. The driving system of the EV is the electric motor and there are several advantages of the electric motor such as fast torque response, the generated torque can be detected accurately and motor can be detached on each wheel [2] Based on these advantages, more effective anti-skid brake system and traction control system (TCS) can be developed on EV. During braking on critical conditions (icy road and cornering), regenerative brake timing control can prevent the tire from lock up and vehicle from skidding. The differential regenerative braking torque control is proposed to improve the stability of the small EV with four in-wheel motors. The simulation result shows that the differential regenerative braking torque control can improve the stability of the small EV with four in-wheel motors
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